switch(screen.width)
{
	case 640: imagen="640x480.jpg"; break;
	case 720: imagen="720x480.jpg"; break;
	case 800: imagen="800x600.jpg"; break;
	case 848: imagen="848x480.jpg"; break;
	case 1024: imagen="1024x768.jpg"; break;
	case 1152: imagen="1152x864.jpg"; break;
	case 1280: imagen="1024x768.jpg"; break;
	case 1400: imagen="1024x768.jpg"; break;
	case 1600: imagen="1600x1200.jpg"; break;
	case 2560: imagen="1600x1200.jpg"; break;
	default : imagen="800x600.jpg"; break;
}
document.write('<style type="text/css">');
document.write('<!--');
document.write('body {');
document.write('	background-image: url(images/'+imagen+');');
document.write('	background-repeat:no-repeat;');
document.write('	margin-left: 0px;');
document.write('	margin-top: 0px;');
document.write('	margin-right: 0px;');
document.write('	margin-bottom: 0px;');
document.write('	background-attachment: fixed;');
document.write('	background-position-x:right;');
document.write('	background-position-y:bottom;');
document.write('}');
document.write('.ListMenu {');
document.write('	font-family: Verdana, Arial, Helvetica, sans-serif;');
document.write('	font-size: 10px;');
document.write('	margin: 0;');
document.write('	padding: 0;');
document.write('}');
document.write('-->');
document.write('</style>');